Auto_complete_for not found?

I tried installing the plugin and it told me it was already installed
but when i go to use it it tells me:

undefined method `auto_complete_for' for AdminController:Class

Here is how i have added it:

class AdminController < ApplicationController
before_filter :check_authentication, :check_authorization
auto_complete_for :user, :username
/other code/

end

Any thoughts?

I tried installing the plugin and it told me it was already installed
but when i go to use it it tells me:

auto_complete, right?

undefined method `auto_complete_for' for AdminController:Class

Here is how i have added it:

class AdminController < ApplicationController
before_filter :check_authentication, :check_authorization
auto_complete_for :user, :username
/other code/

end

Any thoughts?

Have you restarted the application?

I did restart the application. It still did not work.

here is the plug-in i want to use:
http://www.railslodge.com/plugins/743-auto-complete

does this come installed on the latest Rails?

Nope, you need to install it

    script/plugin install auto_complete

-- fxn